Vulnerability Note VU#583108

Microsoft ASN.1 Library improperly decodes constructed bit strings

Overview

The Microsoft ASN.1 Library improperly decodes constructed bit strings which could allow an unauthenticated, remote attacker to execute arbitrary code with SYSTEM privileges.

I. Description

Abstract Syntax Notation number One (ASN.1) is an international standard used to describe and transmit data packets between applications and across networks. There is an integer overflow vulnerability in the BER decoding function of the Microsoft ASN.1 Library. This vulnerability could allow an unauthenticated, remote attacker to execute arbitrary code with SYSTEM privileges on the affected system.

II. Impact

An unauthenticated, remote attacker could execute arbitrary code with SYSTEM privileges.

III. Solution

Apply Patch

Apply the patch (828028) referenced in Microsoft Security Bulletin MS04-007.

Systems Affected

Vendor	Status	Date Updated
Microsoft Corporation	Vulnerable	10-Feb-2004

References

http://www.microsoft.com/technet/security/bulletin/MS04-007.asp
http://support.microsoft.com/default.aspx?scid=252648
http://www.eeye.com/html/Research/Advisories/AD20040210-2.html
http://www.itu.int/ITU-T/asn1/
http://www.asn1.org/

Credit

This vulnerability was reported by eEye Digital Security.

This document was written by Damon Morda.

Other Information

Date Public	02/10/2004
Date First Published	02/10/2004 03:41:00 PM
Date Last Updated	02/10/2004
CERT Advisory
CVE Name	CAN-2003-0818
US-CERT Technical Alerts
Metric	27.72
Document Revision	8

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